The engine’s log file is available in the engine’s working directory.named “log”.
The Discovery log file is named discovery-n.log where n is the log sequence
number, starting at 0. For example, the first log file is named discovery-0.log.

Customers can tail the log file for insight into engine activity.

As of version 2.8.5, the Discovery engine uses the JDK 1.4 logging system. The logging
configuration file can be customized according to this system. The engine’s default logging
configuration file is located in the engine’s releases directory. To configure custom
logging for a specific instance, copy logging.properties to the appropriate working directory
in your engines directory.

The Discovery Search Engine exposes a number of data points that are of interest on a
web service at /ws/statistics. The statistics exposed are transient, all
counters will reset when the engine stops.

For more information on using the munin plugin refer to the description of the
Statistics web service.